基于PTN的城域传输网组网

分析和研究PTN在城域传输网建设与应用中的技术特点与网络使用状况,根据城域传输网自身规模与特点采用合理、科学的组网运行模式,是实现城域传输网全业务运行的主要途径。本文主要对基于PTN技术的城域传输网PTN独立组网模式、PTN+OTN联合组网的运用进行了分析。     

中国移动公司城域传输网的建设

首先阐述了中国移动建设城域传输网的必要性，然后对中国移动城域传输网所承载的移动业务、集团大用户业务、智能小区业务、带宽出租业务等进行了需求分析，认为中国移动城域传输网应主要采用SDH技术、基于SDH的多业务传输平台(MSTP)技术和DWDM技术，同时给出了中国移动城城传输网的分层(核心传输层、汇聚传输层和接入传输层)结构，并结合中国移动城域传输网各层的具体情况，提出城域传输网各层的建设思路，以期指导中国移动城城传输网的建设。     

城域传输网中PTN的组网模式和引入策略

对分组传送网（PTN）技术在城域传输网中的技术定位、组网模式和引入策略进行了分析。技术定位方面,PTN适合应用在城域传输网的汇聚层、接入层;组网模式方面,大中型城域传输网适合采用PTN与ASON/WDM/OTN联合组网模式,对于小型城域传输网初期也可以考虑采用PTN完全独立组网模式;引入策略方面,应采用新老网络共存和逐步替换的方式以最大限度地保护现有投资。     

联通城域传输网特点与华为多业务传输平台

随着IP和数据业务的发展,在大城市出现了大容量、多业务传输要求,这在一定程度上刺激了城域传输网的发展。针对联通城域传输网发展的实际情况,华为曹悦先生《联通城域传输网特点与华为多业务传输平台》一文讨论了SDH、ATM等技术解决多业务传输问题的优缺点,提出了目前应该采用多业务传输平台作为城域传输网的解决方案。介绍了华为公司针对城域传输网骨干传输层、汇接传输层、接入层的METRO系列产品。这对于正在大规模建设城域传输网的运营商具有一定的借鉴意义。     

中兴城域传输网问答

１中兴城域传输网的基本思路是什么？答中兴通讯城域传输网的层次结构分为３层∶城域骨干传输网络、城域汇聚（分配）传输网络、城域接入传输网络。中兴城域传输网总体上以SDH融合节点传输设备作为城域传输网的基础设施和主体设备,辅之以各种其它产品构建城域传输网,可适应各种不同场合。（１）在要求提供ATM、IP、Ethernet等数据业务接入,并只作简单数据处理的应用场合,解决方案如下∶对于ATM业务,采用SDH传输设备,在各层提供不同的ATM业务接入方案∶在骨干层提供１５５M／６２２M／２．５G的ATM光接口将ATM业务接入进来…     

建设面向用户的多业务城域传输平台

本文分析了城域传输网的业务类型、分层结构及主要技术，对城域传输网的组网策略进行了探讨。     

用网块化、层次化思路规划城域传输网接入层

1 城域传输网接入层存在的问题 传输网接入层是传输网的末梢,对业务需求变化极为敏感.在建网初期,中国移动根据业务需求适时提供接入层传输资源,经过多年的建设,中国移动的城域传输网已经成为一个能承载区域内以千计的基站和营业厅业务的庞大网络.随着规模的扩大,城域传输网的弊端也渐渐显现出来,城域传输网以县区汇聚节点为中心,物理路由成放射状覆盖.     

IP城域传输网的特点和解决方案

介绍了城域传输网的业务要求、规划原则以及宽带多业务传输网的几种实现方案,最后提出了吉林省城域传输网的解决思路。     

城域光传输网

主要针对业界广泛关注的城域光传输网的最新技术进展和应用进行探讨 ,分析了市场的最新需求趋势 ,并比较了目前在城域光传输网十分热门的技术方案 ,结合上海贝尔阿尔卡特公司的新一代城域光传输网解决方案 ,阐明了构建新一代城域光传输网可行的体系结构和网络策略。     

低阶DXC在城域传输网中的应用

介绍了低阶DXC在城域传输网中的应用，分析了在骨干和汇接层均采用10Gbit／s设备组网的特大城市城域传输网中，低阶交叉功能在E1电路出租业务中的重要作用。     

DWDM在城域网的应用分析

主要介绍了当前城域网的特点,分析了目前围绕城域网建设的几种传输技术解决方案。其中主要分析了DWDM为平台的特点及相关原理,并介绍了CWDM的特点和发展前景,并指出DWDM是未来城域网建设的主流。     

城域DWDM光网络技术方案研究

主要论述了DWDM光复用、DWDM可配置光环和DWDM网状网等3种主要的DWDM城域核心组网方案，分析了各种方案的特点和应用范围。     

DWDM技术在城域网中的应用

介绍了城域网中引入DWDM技术的必要性，以及DWDM技术的应用和发展趋势。     

Metropolitan DWDM: a dynamically configurable ring for the KomNetfield trial in Berlin

We present the system concept of a dynamically configurable all-optical add/drop multiplexer for metropolitan wavelength division multiplex rings using dense channel spacing (DWDM). We first outline the essential network requirements. Subsequently, an optical system concept is presented that meets these requirements. In the network elements, innovative all-optical switching technology is employed. Tunable fiber Bragg gratings that perform routing functions by wavelength filtering are discussed in more detail. The system is laboratory-tested. It has been installed in Berlin for a multi-vendor field trial within the German research program “KomNet.” Three optical add/drop multiplexers form a dynamically configurable Metro DWDM ring. Metro DWDM accommodates high bandwidths: a metropolitan ring that provides 0.8 terabit/s ring capacity has been demonstrated. Furthermore, Metro DWDM can provide optically transparent channels enabling the transport of various data formats simultaneously, e.g., SONET/SDH and Gigabit Ethernet. Conversion to a standard format becomes obsolete. The all-optical add/drop multiplexer (OADM) presented provides both manual and dynamic configuration. The system concept of the OADM is developed starting with basic metropolitan DWDM network requirements. The features of the DWDM ring are described, followed by a presentation of the system concept of the flexible OADM. Our focus is on dynamic configuration techniques. Since tunable fiber Bragg gratings are promising components for dynamic optical channel switching, this technology is treated in more detail     

The Berlin City Ring—a Testbed for Future Metropolitan Networks

Dense wavelength division multiplexing (DWDM) is the key technology for future data transport. It combines transmission of data rates up to several Tb/s [1] with an overall transparency to data format and bit rate. The expected huge bandwidth demand in the near future requires an adaptability of DWDM transmission technology to metropolitan networks. Therefore, dynamically configurable DWDM transmission technology for bit rates up to 10 Gb/s has been investigated in a field trial in Berlin. This field trial is part of the KomNet research project. It is the goal of this field trial to optimize DWDM systems to metropolitan network requirements. Several aspects are in this paper: (i) A network simulation tool is described which helps to enlighten the profitability of statically and dynamically configured network nodes. (ii) A newly developed technology to add and drop single-wavelength channels is explained. (iii) The scalability of the approach is demonstrated with an aggregate capacity of 0.8 Tb/s. The equipment has already been installed in the field and is ready for experiments.     

DWDM系统中的Interleaver技术

目前密集波分复用(DWDM)系统已广泛应用于长途干线、城域网．并扩展至接入网。其中波分复用／解复用器是系统的核心器件之一．而50GHz的密集波分复用更要靠一种交叉波分复用(Interleaver)的全新器件．为此详细阐述了Interleaver的原理、主要实现方案及其特点。     

A differentiated optical services model for WDM networks

This article addresses the issues of scalable end-to-end QoS in metropolitan DWDM networks serving as transit networks for IP access networks. DWDM offering a few wavelengths has been deployed in the past in backbone networks to upgrade point-to-point transmission where sharing is based on coarse granularity. This type of DWDM backbone network, offering a few light-paths, provides no support for QoS services traversing the network. As DWDM networks with larger numbers of wavelengths penetrate the data-centric metro environment, specific IP service requirements such as priority restoration, scalability, dynamic provisioning of capacity and routes, and support for coarse-grain QoS capabilities will have to be addressed in the optical domain in order to achieve end-to-end QoS over a DWDM network. We propose a QoS service model in the optical domain called differentiated optical services (DoS) based on a set of optical parameters that captures the quality and reliability of the optical lightpath     

基于宽带IP组网技术的城域传输网的研究

介绍了宽带城域传输网的概念、特点及发展方向，并分析了城域网宽带IP组网技术，提出了城域网建设的发展方向是城域DWDM，而最具潜力的方案是GE/10 GE over DWDM；给出了GE over DWDM实现的技术分析；最后探讨了IP over WDM的自愈保护方式。     

CWDM技术在IP-MAN网中的应用策略

探讨了CWDM技术在IP-MAN网中的应用策略.主要内容包括:CWDM及其与DWDM的区别,IP-MAN网络的通信特征分析,以及CWDM在IP-MAN网建设中的意义与作用.     

光通信新动向

光通信在２０世纪为扩大网络传输容量起到了巨大的作用，在２１世纪将把通信网从电到光推向更高的台阶。本文对最近光通信领域的发展动向进行了归纳和总结，涉及到城域ＤＷＤＭ、ＯＣ－７６８Ｓｏｎｅｔ、光交换、光孤子、无源光网、可调谐激光器、光域业务互连、甚短距光设备和自由空间光网系统等九个方面。